Indexing attachment for grinding machines



Jar' 2,- 1940. G. T. MusKoyiN y INDEXING ATTACHMENT FOR GRINDING? MACHINES Filed Nov. 2, les 2 sheets-sheet 1 GEDRGETMUSKDVIN l' .FISE

Jam 2', 1940- G. T. MusKovlN 2,185,560.

IDUDEXING ATTACHMENT FOR @BIND-ING MACHINES Filed Nov. 2. 19:58 y 2 sneetsf-sneet'z GEUHGETMUEKUWN wfgwff www Patented Jan. 2, 1940 mDExlNG 'AT'rgAnwENT Fon GRINDING George T.

to Norton Company,

EINES Muskovin, Worcester,

Worcester,

Mass., assignor Mass., a corporation of Massachusetts Application November 2, 1938, Serial No. 238,458

2 Claims.

1 attachment in connection with va diall gauge acable drivingdog, not shown. The grinding wheel Vwith V-ways,

curately to locate a grinding wheel to grind a number of shoulders. Another object of the invention is to provide a device for predetermining with exactitude various positions of a. grinding wheel with respect to a work holder or holders. Another object of the inventionis to provide a simple device for accurately locating the work carriage or table of a grinding machine. Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists inthe features of construction, combinations of elements, and arrangements of parts,l tratively described herein, and the scope of the application of which will b'e indicated in the following claims.

In the accompanying drawings illustrating one of many possible embodiments of the mechanical features of this invention,

Flgurel is a front elevation of a grinding machine having` the attachment mounted thereon;

Figure 2 is an enlarged front relevation of the attachment and gauge with a fragment of/ the grinding carriage;

Figure 3 is an end view'of the gauge.

Referring nrst to Figure 1, th'e invention may be incorporated in lor applied to a cylindrical attachment and grinding machine of any desired type and so far' as certain features of the invention are concerned it may be embodied in other types of grinding machines. 'As illustrative of the application of the invention, I have shown in Figure 1 a grinding machine comprising a base -III having, as shown in Figure 3, a flat way II which together notshown,I supports a carriage I2 mounted for reciprocat'ory movement and indexing upon the base III, The carriage I2 supports a work table I3 which may be` secured to the carriage I2 in parallelism therewith or placed at an angle thereto by well-known apparatus the table I3 is mount- Referring to Figure 1, upon ed headstock I4 which journals a spindle for'a -face plate I5, the spindle being driven by an electric motor I6 and belts contained in a casing I1. -A tailstock I6 is also supported upon the table I3. The g betweema head center 2li and rotated `from the face anda tail center -2I plate I5 by any suit- 25 is mounted on a spindle journalled in -a wheel an indexingall as'will be illus- 1 yria'ge I2.

tends a stop screw work pie'ce- W is vsupported head 26, the spindle being driven by belts in a casing 21 which are driven by a motor 28.

The wheel head 26 is mounted on integral with a cross slide which can toward and from the work feeding mechanism now well known in the art. Such may include a solenoid 30 actuating a pawl 3| which moves a ratchetv wheel 32 mounted on a shaft 33, which shaft is connected by reduction gearing, not shown, to the cross feed screw shaft. Likewise a well known mechanism may be provided for moving the carriage I2 and table I3; forexample, a hand wheel 35 has connected thereto a pinion gear, not shown, meshing with a spur gear 36 which is connected to a pinion gear 31 meshing with a rack 38 attached to the under side of the carriage I2.

The foregoing constitutes some of the elements of a plain cylindrical grinder which I shall not further describe here stop device 50 be moved and an adis attached v device 50 is attached to the base I0 whilev the adjustable stop device 5I is attached. to'the car- The machines, and the adjustable stop device 5I comprises anangle bracket having a bolt 53 with a head 54 in the T-slot which can `be tightened by means of a knurled nut 55. The upper part of the angle bracket constituting the adjustable stop has a circular depression which holds a dial gauge 56 of any suitable or known type. This dial gauge 56 is operated by a movable plunger 51 which constitutes the contacting element of the stop.

The variable stop 56 comprises a 'pad 60 bolted to the base III having integral arms 6I between which is journalled an arm 63. The arm 62 'can' be swung downwardly out of the way to put the variable )action altogether; at such `.times close to the base I0 in a vertical position extending downwardly from ,the arms6I. The arm -62 has an integral lug 63av through which ex- 64 having a nut 65. This stop screw 64 engages the top of the pad 60 for `locatingl the arm 62 in-its upper position.

the arm 62 lies Integral with the arm 62 is a hub 10 having piece W yby across table or carriage I2 includes a T-slot 52 such asis usually provided in grinding 62 on a pin.

or formed n stop out of .Y

'from the machine.

hand endof the pawl 13 is a bar 16 receiving a pair of downwardly extending pins 11 which through lugs 18 extending laterally from the hub 10.` Springs 19 surround the pins 11 and thus urge the right-hand end of the pawl 13 upwardly which urges the left-hand end thereof downwardly.

'I'he notches 80 in rod 1| form frusta-conical portions on the rod 1| with abrupt right plane surface shoulders. Thus the rod 1| can be moved to the left but not to the right excepting when the pawl 13 is actuated. The rod 1| can be located in an exact position by pressing one of the shoulders of one of the notches 80 against the tooth of the pawl 13. Thereupon a.' hand screw 8| extending through the hub 'i0 may be used rigidly to secure the rod 1| in position.

In' one manner of operating the machine, the operator rst procures a rod 1| which has notches 80 located the same distance apart as the distance to be established by the various shoulders on the work piece W. He then inserts this rod in the bore of the hub 1G and locates the pawl 13 in the right-hand notches 80. He then takes the first of a lot of work pieces W and grinds a given shoulder to a finished surface the exact required distance from the end of the shaft, In doing this, the operator uses the hand wheel 35 and proceeds according to the old and known procedure, using any suitable hand caliper or scale to measure the distance of the shoulder from the end of the shaft. At this time the adjustable stop 5| should b e kept well out of the way.

The operator then .brings the plunger 51 of the gauge 5'6 of the adjustable stop 5| into position against the end of the rod 1|. -He does this just at the end of the grinding operation while the wheel is still sparking out the ground surface on the work piece. |Ihe hand wheel 35 is not touched but the knurled nut 55 is loosened and the plunger 57 caused to contact with the rod lli.

At this point anattempt is made to adjust the adjustable stop 5| to bring the needle `on the dial gauge 56 to some even and convenient reading. For example, the reading zero may be selected, or with some dial gauges a reading 5, 10, 20 etc. might be selected. It may be difcult to establish an exact even numbered reading on the dial gauge, in which event the operator merely remembers the particular reading as he clamps the adjustable stop 5| in positionby means of the knurled nut'55.

The operator now loosens the screw 8| and depress'es the knob 15 and then slides the rod 1| to the right. It will stop with the pawl 13 inv the next notch 30. Holding the rod 1| firmly to the right, he tightens the screw 3|. He then backs oir the cross slide by rotating the wheel 32 by hand and then traverses the table (to the right in this illustrative embodiment) to bring the grinding Wheel into contact with the next shoulder. I-l'e then proceeds to grind, using the hand wheel 35 to feed and' using the wheel 32 to bring the periphery of the grinding wheel 25 as close to the cylindrical part of the` Work piece as desired. Also, if desired, the cylindrical surface of the work piece may be nished by the grinding wheel 25 before or after-grinding a particular shoulder and without 'removing the work piece Having established contact between the side face of thewheel and the second shoulder to the required depth as determined by the cross feed ofthe machine, the operator proceeds to feed the wheel into the work piece by moving the carriage I2 by means of the hand wheel 35 until the needle and dial gauge 56 registers the same as it registered during the set-l ting of the adjustable stop 5| at the end of the grinding of the rst shoulder. The second shoulder is now done and the third shoulder or any succeeding number may be ground in like manner.

Many variations in the use of the apparatus may be and undoubtedly will be employed.` Also for certain purposes the adjustable stop 5| might have a contacting member which is integral therewith. However, there are certain advantages in using a dial gauge insomuch as the grinding can be done by a feeding movement.

In such grinding operations, the traverse operating wheel 35 is used as a grinding wheel feed and the cross feed ratchet wheel 32 is used as a positioning feed. Thus the function of the wheels 35 and 32 is reversed from the usual practice and the side face instead of the periphery of the wheel does the grinding. Therefore, the provisionl of a gauge 56- accurately to determine how muchvfeed has been given by the traverse wheel is a feature of considerable advantage and the ab'ility to shift quickly from one shoulder to another merely by depressing the knob 15 and sliding the rod 1| permits grinding to be done v ery rapidly. For example, it is possible to do a little grinding on each of the shoulders to any given amount, then to nish them all on with the apparatus of this invention, using the valve stop mechanism to shift from one shoulder to another, knowing that whichever shoulder the operator is working upon, the amount ground ofi' and to be ground off will always be measured by the dial gauge 56. In certain cases the screw 8| may be omitted since the pressure of the plunger against the rod 1| can usually be relied upon to hold the shoulders in the notches rmly against the pawl 13.

It will thus be seen that there has been pro.- vided by this invention an apparatus in which the various objects hereinbefore set forth together with many thoroughly practical advantages are successfully achieved. As many possible embodiments may be made by the above invention and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

A1. In a grinding machine, a base, a table or carriage mounted on said base, a variable stop mounted on one of said parts, an adjustable stop mounted on another of said pa said variable stop comprising amounting pad, a arm mounted in said pad for vertical swinging movement,l

yGEORGE r. MUsKovIN.

locating stop 

